Deck size is 20 cards over. Again I would cut the Megas down to about 4-5, Ultimates to about 6-7, then have the rest be Champions and Rookies saving about 8-10 cards of space for Power Options. The one downside to having only one Rookie especially one like Biyomon which has only one copy is a card that came out in the later series called "Digital Gate". A very mean card that sends the opponents Rookie card Offline. In Digi-Battle you need to have a Rookie on your playing field at the start of the Battle phase, so if you lose in a Battle to that card in the previous match and your stuck the next turn with no Rookie to put in its place, you lose the game automatically. So when revolving a deck around one Rookie make sure to have multiple versions from different sets. I am seeing that you are getting better at branching off your Champions.